Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8343778 | Molecular Genetics and Metabolism | 2015 | 4 Pages |
Abstract
Aromatic l-amino acid decarboxylase (AADC) deficiency is an inborn error of metabolism affecting the biosynthesis of serotonin, dopamine, and catecholamines. We report a case of AADC deficiency that was detected using the Global MAPS platform. This is a novel platform that allows for parallel clinical testing of hundreds of metabolites in a single plasma specimen. It uses a state-of-the-art mass spectrometry platform, and the resulting spectra are compared against a library of ~Â 2500 metabolites. Our patient is now a 4Â year old boy initially seen at 11Â months of age for developmental delay and hypotonia. Multiple tests had not yielded a diagnosis until exome sequencing revealed compound heterozygous variants of uncertain significance (VUS), c.286G>A (p.G96R) and c.260C>T (p.P87L) in the DDC gene, causal for AADC deficiency. CSF neurotransmitter analysis confirmed the diagnosis with elevated 3-methoxytyrosine (3-O-methyldopa). Metabolomic profiling was performed on plasma and revealed marked elevation in 3-methoxytyrosine (Z-score +Â 6.1) consistent with the diagnosis of AADC deficiency. These results demonstrate that the Global MAPS platform is able to diagnose AADC deficiency from plasma. In summary, we report a novel and less invasive approach to diagnose AADC deficiency using plasma metabolomic profiling.
Keywords
Aromatic l-amino acid decarboxylase deficiency3-O-methyldopa5-HTPAADCSAMOculogyric crisisS-adenosylhomocysteineSAH3-MT5-hydroxytryptophanCOMT5-HIAA5-Hydroxyindoleacetic acidl-3,4-dihydroxyphenylalaninel-DOPAS-adenosyl-L-methionineCSFCerebrospinal fluidMapshomovanillic acidmetabolomic profilingHVAcatechol-o-methyl transferase
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Authors
Paldeep S. Atwal, Taraka R. Donti, Aaron L. Cardon, C.A. Bacino, Qin Sun, L. Emrick, V. Reid Sutton, Sarah H. Elsea,